... you're trapped like a rat in a maze?
These buttons appeared at work today, next to all of the doors that exit to the outside:
It says what it is and it does what it says.
And it's true - the door won't open unless you push the button. Don't even ask me what happens when there's a power outage, or worse, a fire that knocks out the power...
-Andy.
That's funny. Puts everything in perspective, huh?
Usually these things are battery backed (some are just POE). If it's also an access card system, it keeps a copy of that door's ACLs locally.